Factorial, a developer of solid-state battery technology based in the United States, has announced that cells designed for aerospace applications have attained an energy density of 450 Wh/kg. This performance level was originally targeted for completion by the end of 2026. The company disclosed this achievement alongside its third-quarter financial results on November 10, also noting that it had begun generating commercial revenue—a milestone the firm had previously expected to reach in 2027.
The specifics surrounding these cells remain largely undisclosed by Factorial. The company has not revealed the cells' capacity, chemical composition, or the testing parameters under which the measurements were taken. Additionally, there is no indication whether an independent party has verified the 450 Wh/kg figure. The initial commercial revenue announcement similarly lacks detail, with Factorial declining to name either the revenue figure itself or identify the customer.
Factorial has highlighted several real-world applications of its battery technology. A Group I drone equipped with Factorial's cells achieved a flight-duration record of 521 minutes in 2026, traveling approximately 483 kilometers (300 miles). In the automotive domain, a minimally modified Mercedes-Benz test vehicle demonstrated a range exceeding 1,200 kilometers (746 miles) on a single charge. Stellantis has also incorporated the technology into a Dodge Charger Daytona demonstration vehicle. The company counts Mercedes-Benz, Stellantis, Hyundai and Kia among its financial backers.
Scaling production remains dependent on manufacturing partnerships. During September 2026, Factorial entered into an agreement with Mitsui Kinzoku, a Japanese company, to expand manufacturing capacity for its Solstice all-solid-state cells. Mitsui Kinzoku brings specialized knowledge in the production of solid electrolytes to the collaboration. To date, neither organization has made public the production capacities or implementation schedule for this partnership.
Source: Battery-News
